I have no clue where to ask this, so here it goes... With the advent of LK99 and its potential uses in recent solutions for modified Alcubierre drive fields, it pushes me to wonder: What if humanity became an interstellar or even intergalactic civilisation. What would be the universal currency that would unanimously be used to transact?
Im asking about what kind. Being an interstellar civilisation, rare metals would not be a feasible store of wealth as there would be such an abundance. Would it be something like a fiat, or even a blockchain currency? I was thinking even possibly energy as a form of wealth. Pure energy is universal, finite (as far as we know), takes "work" to "make", is easily transferable, can be precisely quantified and has a definite use... Now as to how one would store this energy is a whole other question, so maybe we would only consider the amount of joules that is held in a body? Therefore making more "energy dense" bodies more valuable as they occupy less physical space? This is just random speculation and rambling, but would anyone have any ideas as to this?